OPTICAL TRANSMISSION DEVICE, OPTICAL CONCENTRATION NETWORK SYSTEM AND DATA TRANSMISSION INSTRUCTION METHOD

PROBLEM TO BE SOLVED: To simultaneously implement reduction of delay in data transmission from an ONU, reduction of delay fluctuation, avoidance of delay fluctuation of a downlink signal and suppression of band consumption with a control signal during a communication between an OLT and the ONU.SOLUT...

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Main Authors ONDA HIDETOSHI, ARAYA KATSUHIRO, GYODA KATSUTOSHI, NAKAGAWA MASAHIRO, NAMIKI MASATOSHI
Format Patent
LanguageEnglish
Japanese
Published 05.07.2018
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To simultaneously implement reduction of delay in data transmission from an ONU, reduction of delay fluctuation, avoidance of delay fluctuation of a downlink signal and suppression of band consumption with a control signal during a communication between an OLT and the ONU.SOLUTION: An OLT 21 transmits, using a gate signal, an allocation band to which a data transmissible band of an ONU 32Aa is allocated, and allocation transmission timing of a term corresponding to a DBA term T within the DBA term T in which DBA calculation for dynamically allocating a band corresponding to traffic volume of data that the ONU 32Aa receives from a host 43a, is performed at predetermined intervals, through the DBA calculation. Regarding the ONU 32Aa, an instruction of data transmission to the OLT 21 is performed on the ONU 32Aa in accordance with divided transmission timing of a dividing number (n) obtained by dividing an allocation interval corresponding to a term of the allocated transmission timing in the gate signal received from the OLT 21 by a data transmission period predetermined for the ONU 32Aa and the divided allocation band obtained by dividing an allocation band in the gate signal by the dividing number (n).SELECTED DRAWING: Figure 1 【課題】ＯＬＴとＯＮＵ間の通信において、ＯＮＵからのデータ伝送時の低遅延化及び低遅延揺らぎ化と、下り信号の遅延揺らぎ回避と、制御信号に伴う帯域消費の抑制とを同時に実現する。【解決手段】ＯＬＴ２１は、ホスト４３ａからＯＮＵ３２Ａａが受信したデータのトラフィック量に応じた帯域を動的に割り当てるＤＢＡ演算により、当該ＤＢＡ演算が所定間隔で行われるＤＢＡ周期Ｔ内で、ＯＮＵ３２Ａａのデータ送信可能な帯域を割り当てた割当帯域と、ＤＢＡ周期Ｔに対応する周期の割当送信タイミングとをゲート信号で送信する。ＯＮＵ３２Ａａは、ＯＬＴ２１から受信したゲート信号内の割当送信タイミングの周期に対応する割当間隔を、ＯＮＵ３２Ａａに予め定められたデータの送信周期で除算した分割数ｎの分割送信タイミングと、ゲート信号内の割当帯域を分割数ｎで分割した分割割当帯域とに応じて、ＯＬＴ２１へのデータ送信指示を、ＯＮＵ３２Ａａに行う。【選択図】図１
Bibliography:Application Number: JP20160249732